Helm to Gregg Transmission Corridor

The Helm to Gregg transmission corridor project is a new 500-kV line extending approximately 31 miles to connect the Helm substation near the city of San Joaquin to the Gregg substation located north of Fresno. The planned line is part of the construction of the Westlands Solar Park in Frenso, CA. The facility’s anticipated output will be nearly 2,400 MW which will will need the added carrying capacity for the existing transmission infrastructure.

Project Sponsor Line Miles Voltage (kV) From State To State Year in Service
Westlands Water District 31 500 CA CA 2018
Estimated Costs ($M) Voltage Type Project Status Project Group Origin Point Destination Point
150 Suspended Westlands Competitive Renewable Energy Zone Helm Gregg
Interstate Build Start NERC ISO/RTO Country Project Partners
2016 WECC CAISO US